From Bis(borylene)-Substituted Xanthenes as Reactive Intermediates to Diboraoxirane Complexes.

ABSTRACT: The first N-heterocyclic carbene (NHC)-stabilized diboraoxirane complex 4 [NHC = IPr = C{N(iPr)CMe}₂] was synthesized through the reduction of the corresponding bis(dichloroboryl-IPr)xanthene 3 with potassium graphite. Intriguingly, its formation stems from a diboron(I)-mediated C-O-C deoxygenation of the xanthene spacer via a bis(borylene)xanthene as a reactive intermediate. Consistent with the proposed pathway, bis(borylene)xanthene 6 with three-coordinate B(I) atoms could be isolated when the sterically less demanding NHC ligand IMe [IMe = C{N(Me)CMe}₂] was employed. Due to its ring strain, the B-B bond of the B₂O ring in 4 undergoes versatile ring-expansion reactions with small molecules to engender new boron-containin

SUBMITTER: Fan J 

PROVIDER: S-EPMC11869280 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature